pub fn plan_tail(
scx: &StatementContext<'_>,
_: TailStatement<Aug>,
copy_to: Option<CopyFormat>
) -> Result<Plan, PlanError>
pub fn plan_tail(
scx: &StatementContext<'_>,
_: TailStatement<Aug>,
copy_to: Option<CopyFormat>
) -> Result<Plan, PlanError>